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Basis of Presentation - Summary of Revenue Earned by Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Total revenue | $ 133,786 | $ 127,791 | $ 270,144 | $ 258,711
Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Total revenue | 63,524 |  | 126,126 |
Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Total revenue | 34,333 |  | 69,215 |
Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Total revenue | 23,199 |  | 46,258 |
Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Total revenue | 8,469 |  | 16,833 |
Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Total revenue | 3,339 |  | 9,480 |
Base Rent [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 97,828 |  | 193,171 |
Base Rent [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 40,476 |  | 79,651 |
Base Rent [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 29,919 |  | 59,813 |
Base Rent [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 20,861 |  | 40,940 |
Base Rent [Member] | Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 4,949 |  | 9,434 |
Base Rent [Member] | Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 2,109 |  | 4,305 |
Straight Line Rent [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 3,026 |  | 8,231 |
Straight Line Rent [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 2,943 |  | 7,282 |
Straight Line Rent [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 507 |  | 1,006 |
Straight Line Rent [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | (361) |  | (153) |
Straight Line Rent [Member] | Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | (49) |  | 207 |
Straight Line Rent [Member] | Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 106 |  | 124 |
Point of Sale [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 6,803 |  | 12,615 |
Point of Sale [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 6,280 |  | 11,621 |
Point of Sale [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 80 |  | 128 |
Point of Sale [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 256 |  | 496 |
Point of Sale [Member] | Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 129 |  | 251 |
Point of Sale [Member] | Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 58 |  | 119 |
Rents [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 107,657 | 101,557 | 214,017 | 204,889
Rents [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 49,699 |  | 98,554 |
Rents [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 30,506 |  | 60,947 |
Rents [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 20,756 |  | 41,283 |
Rents [Member] | Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 5,029 |  | 9,892 |
Rents [Member] | Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 2,273 |  | 4,548 |
Tenant Reimbursements [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 18,688 | 18,038 | 38,537 | 36,573
Tenant Reimbursements [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 12,132 |  | 24,498 |
Tenant Reimbursements [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 3,170 |  | 7,091 |
Tenant Reimbursements [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 857 |  | 1,785 |
Tenant Reimbursements [Member] | Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 1,991 |  | 3,972 |
Tenant Reimbursements [Member] | Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 661 |  | 1,426 |
Termination Fees [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 582 | 140 | 1,132 | 1,813
Termination Fees [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 108 |  | 155 |
Termination Fees [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 405 |  | 839 |
Termination Fees [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | 69 |  | 138 |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 4,913 |  | 12,587 |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 217 |  | 429 |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 4 |  | 12 |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 1,386 |  | 2,851 |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 1,431 |  | 2,932 |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 404 |  | 3,499 |
Other Income [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 1,946 |  | 3,871 |
Other Income [Member] | Philadelphia CBD [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 1,368 |  | 2,490 |
Other Income [Member] | Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 248 |  | 326 |
Other Income [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 131 |  | 201 |
Other Income [Member] | Austin, Texas [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 18 |  | 37 |
Other Income [Member] | Other [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 1 |  | 7 |
Corporate [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Total revenue | 922 | $ 2,511 | 2,232 | $ 4,480
Corporate [Member] | Base Rent [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | (486) |  | (972) |
Corporate [Member] | Straight Line Rent [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | (120) |  | (235) |
Corporate [Member] | Rents [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Lease revenue | (606) |  | (1,207) |
Corporate [Member] | Tenant Reimbursements [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | (123) |  | (235) |
Corporate [Member] | Third Party Management Fees, Labor Reimbursement and Leasing [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | 1,471 |  | 2,864 |
Corporate [Member] | Other Income [Member] |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |
Service and other revenue | $ 180 |  | $ 810 |

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